Emergency system for hand operation of magnetically operated hydraulic valves - has emergency hand operated pin led movable sliding in guide recess and outer endface of which valve is operated by ram type tool insertable from outside

摘要

The endface (118) of the emergency hand operated pin (148) has a lowered supporting surface (158) which is designed flat or with a convex curve, and is concentrically surrounded by an inlet chamfer (160), for the centring of the ram type tool (120). The lowered supporting surface (258, fig.3) can be designed with a spherical curvature. The emergency hand operated pin (148) is mounted guide across a section with a cylindrical cross section in the guide recess (146). ADVANTAGE - Also designed for repeated emergency operation ensured with small constructional cost. Pin operation is reliable without detracting from valve operation with return to its original setting.